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Finding the Fourth Proportional to 396.81, 547.54 and 219.74

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Solution

The fourth proportional to 396.81, 547.54 and 219.74 is: 303.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.81 : 547.54 = 219.74 : x
  2. Step 2: Convert to fraction form
    396.81/547.54 = 219.74/x
  3. Step 3: Cross multiply
    396.81x = 547.54 × 219.74
  4. Step 4: Simplify right side
    396.81x = 120,318.08
  5. Step 5: Solve for x
    x = 120,318.08/396.81
  6. Step 6: Final answer
    x = 303.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.